One possibility could be that their son inherits Naruto's determination and Talia's intelligence. He might grow up in a world that combines the elements of Naruto's ninja world and Talia's own fictional background. Maybe he has to face a new threat that neither of his parents' worlds have seen before, and he uses a unique combination of his parents' skills and values to overcome it.
Since Naruto is known for his shadow clones, their son could have an upgraded version of this ability. He might be able to create clones that not only look like him but also have different skills based on Talia's abilities. For instance, some clones could have her stealth skills while others could have her strategic thinking abilities, making his combat and problem - solving strategies much more diverse.
A possible fanfiction plot could involve Naruto being sent to the DC universe to learn new forms of combat. He meets Talia al Ghul who offers to train him in her unique fighting style. As they train together, they discover that they have more in common than they thought, like their loyalty to their respective causes and their ability to make tough decisions. Their relationship could develop into a strong friendship or something more as they continue to explore each other's worlds.
A fanfiction could also focus on the clash of their ideologies. Naruto believes in the power of friendship and hard work, while Talia has been brought up in a world of power plays and shadowy organizations. This ideological difference could be the source of great conflict and growth for both characters as they try to understand each other and find a middle ground.
One possible aspect of a Naruto and Talia al Ghul fanfiction could be a crossover of their worlds. Naruto's ninja skills and his strong sense of justice could interact in interesting ways with Talia's complex background in the DC universe. For example, they might team up to fight a common enemy that threatens both their realms. Naruto's ability to form strong bonds with his comrades could also influence Talia, who has often been in a morally grey area in her own storylines.
One interesting Naruto and Talia fanfiction could be about them teaming up on a mission in a crossover world. Maybe they have to face a powerful enemy that neither of their original universes has seen before.
A more complex fanfiction could be about a prophecy that involves both Naruto and Kate Talia al Ghul. They are brought together by a seer who claims that only by combining their powers and knowledge can they prevent a great disaster. Along the way, they face many challenges, not only from the impending doom but also from the political intrigue and power struggles in Kate Talia al Ghul's world, as Naruto's presence disrupts the existing power balance.
You can try fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfictions from various fandoms, and you might be able to find some great Naruto and Talia ones there.
They could start as adversaries. Maybe Kate Talia al Ghul sees Naruto as an unknown threat and tries to eliminate him. But as they engage in combat, they realize that they have a mutual respect for each other's skills. For example, Naruto's speed and strength might surprise Kate Talia al Ghul, and her strategic mind and combat finesse could impress Naruto.
Begin with Naruto being summoned by a powerful magic user in the DC universe who has heard of his powers. This magic user happens to be an acquaintance of Talia al Ghul. When Naruto arrives, Talia is skeptical of his abilities. So, Naruto has to prove himself, which could be a great way to introduce their characters and start building the story. This initial conflict can lead to various developments in their relationship as the fanfiction progresses.